Improvement in machines for rolling pointed metal articles



M LOUGHRAN. Machine for Rolling Pointed Metal Articles.

No. 212 241. Patented Feb. 11,1879

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U ITED STATES PATENT Or r rcn.

MICHAEL LOUGHRAN, OF PITTSBURG, PENNSYLVANIA.

IMPROVEMENT IN MACHINES FOR ROLLING POINTED METAL ARTICLES.

Specification forming part of Letters Patent No. 212,241, dated February11, 1879; application filed November 1, 1878.

To all whom it may concern:

Be it known that I, MICHAEL LOUGHRAN, of Pittsburg, in the county ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in Rolling Pointed Metal Articles; and I do herebydeclare that the following is a full, clear, and exact description ofthe invention, which will enable others skilled in the art to which itappertains to make and use the same, reference being bad to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

Figures 1 and 2 are front elevations of my invention, showin gthe rollsin different phases. Fig. 3 is a transverse section. Fig. 4 is a view ofa barrow-tooth made by them. Fig. 5 is a View of a blank bar produced'bymy rolls. Fig. 6 is a view of one sect-ion, showing two teeth rolledhead to head.

This invention relates to an apparatus for rolling pointed articles ofmetal, such as harrow-teeth, split-link blanks, &c.; and consists in theconstruction and combination of parts, substantially as hereinafterfully described and claimed.

The invention may be carried into effect by altering a pair of ordinaryrolls, as hereinafter explained; but I prefer to use a special pair ofrolls, and therefore will illustrate the lat- A A designate two shaftsor spindles, geared together, so as to revolve in unison, by the pinionsB B. O O designate my rolls placed in line with each other on shafts AA. Each iroll has a groove, a, the main part of which has parallel sidesand edges, which, at one or more points in the length of the groove,taper down laterally and vertically into a pointinggroove, 1), thepointing groove tapering in both directions, as shown. The groove may besquare, hexagonal, oval, round, orotherwise, as desired. The faces ofthe rolls may be plain, as shown, by dotted lines in Fig. 2, or they maybe made retreating from the edges of the grooves, as shown by fulllines. The latter form I prefer, though it is not essential tosuccessful operation.

In practice I insert a billet or bar (from the finishing rolls) of suchsection-diamond form-as to just fill the main groove. The draft is justenough to crush down the dia mond and fill the groove without finning.\Vhen the tapers come to bear on the bar it crushes out the extra metalin a broad fin at that point, which can readily be removed. As this thinfin does not make the best quality of scrap, I cut away the face of theroll at the taper, bringing it to a sharp edge, 0, having a space, d,outside, of no draft. When this comes to bear upon the bar it acts witha shearing force, the edge 0 cutting down the metal, leaving no fin, butshearing out the metal at each side in a solid mass, and disengaging it,so as to leave the edges of the blank comparatively finished, whileproducing a scrap of the most desirable quality.

It being sometimes required to make har row-teeth with a sort of head,like that shown in Fig. 4, I accomplish such result by making the groovewith a flattened part, c, as in Fig. 3. The result, then, of theforegoing construction is a blank-rod (exhibited by Fig. 5) havin galternating double tapers i, parallels k, and swellings m, (in producingthe last, the billet ought to be slightly larger in section.) The bar issevered at the middle of each double ta per c, giving sections, Fig. 6,of two teeth, head to head. These are divided at the middle, forming twocomplete pointed teeth, with or without heads.

Splitdink blanks and other pointed shapes are produced in substantiallythe same man ner.

All these articles are at present usually made by cutting a bar intolengths, reheating these, and then pointing under the hammer. They areheaded by a special machine; butI take the bar while in its originalheat and finish at once with the rolls, thereby producing a bettertexture, a perfectly uniform size, and altogether a more salable articlethan can be produced in the old way, whileI attain great economy oftime, labor, and fuel, and do away with the necessity of a steamdiammerand a heading-machine.

I claim as my invention The described apparatuslbrrollin gblanksforning, and a continuous bar of blanks is formed at one pass. I

In testimony that I claim the foregoing as my own- I aflix my signaturein presence of two witnesses.

MICHAEL LOUGHRAN.

Witnesses:

PHILIP ARBERGAST, 'l. J. McTIeHE.

